fix

src/components/map/CableMap.tsx

@@ -64,40 +64,59 @@ export default function CableMap({ locations }: CableMapProps) {
     [locations]
   );
 
-  const initialEdges = useMemo(
-    () =>
-      locations.flatMap((location) =>
-        location.startCables.flatMap((cable) => {
-          const route = [
-            { id: String(cable.startLocationId), name: location.name },
-            ...cable.intermediateStops.map((stop) => ({
-              id: String(stop.location.id),
-              name: stop.location.name,
-            })),
-            { id: String(cable.endLocationId), name: cable.endLocation.name },
-          ];
+  const initialEdges = useMemo(() => {
+    const edges = locations.flatMap((location) =>
+      location.startCables.flatMap((cable) => {
+        const route = [
+          { id: String(cable.startLocationId), name: location.name },
+          ...cable.intermediateStops.map((stop) => ({
+            id: String(stop.location.id),
+            name: stop.location.name,
+          })),
+          { id: String(cable.endLocationId), name: cable.endLocation.name },
+        ];
 
-          return route.slice(1).map((target, index) => {
-            const source = route[index];
-            return {
-              id: `cable-${cable.id}-${index}`,
-              type: "cable",
-              source: source.id,
-              target: target.id,
-              data: {
-                label: cable.identifier,
-                coreCount: cable._count.cores,
-                cableId: cable.id,
-                sourceName: source.name,
-                targetName: target.name,
-                onEdgeClick: () => setSelectedEdgeId(cable.id),
-              },
-            };
-          });
-        })
-      ),
-    [locations]
-  );
+        return route.slice(1).map((target, index) => {
+          const source = route[index];
+          return {
+            id: `cable-${cable.id}-${index}`,
+            type: "cable",
+            source: source.id,
+            target: target.id,
+            data: {
+              label: cable.identifier,
+              coreCount: cable._count.cores,
+              cableId: cable.id,
+              sourceName: source.name,
+              targetName: target.name,
+              onEdgeClick: () => setSelectedEdgeId(cable.id),
+            },
+          };
+        });
+      })
+    );
+
+    const counts = new Map<string, number>();
+    edges.forEach((edge) => {
+      const key = `${edge.source}->${edge.target}`;
+      counts.set(key, (counts.get(key) ?? 0) + 1);
+    });
+
+    const indexes = new Map<string, number>();
+    return edges.map((edge) => {
+      const key = `${edge.source}->${edge.target}`;
+      const index = indexes.get(key) ?? 0;
+      indexes.set(key, index + 1);
+      return {
+        ...edge,
+        data: {
+          ...edge.data,
+          parallelIndex: index,
+          parallelCount: counts.get(key) ?? 1,
+        },
+      };
+    });
+  }, [locations]);
 
   const [nodes,, onNodesChange] = useNodesState(initialNodes);
   const [edges,, onEdgesChange] = useEdgesState(initialEdges);

src/components/map/CableMapEdge.tsx

@@ -9,6 +9,8 @@ type CableEdgeData = {
   sourceName?: string;
   targetName?: string;
   onEdgeClick?: () => void;
+  parallelIndex?: number;
+  parallelCount?: number;
 };
 
 export default function CableMapEdge({
@@ -33,6 +35,9 @@ export default function CableMapEdge({
   const edgeId = `edge-${id}`;
   const strokeWidth = 1 + Math.min(data.coreCount, 8) * 0.4;
   const strokeColor = selected ? "#1d4ed8" : "#64748b";
+  const parallelCount = typeof data.parallelCount === "number" ? data.parallelCount : 1;
+  const parallelIndex = typeof data.parallelIndex === "number" ? data.parallelIndex : 0;
+  const startOffset = `${((parallelIndex + 1) / (parallelCount + 1)) * 100}%`;
 
   return (
     <>
@@ -46,7 +51,12 @@ export default function CableMapEdge({
         onClick={() => data.onEdgeClick?.()}
       />
       <text>
-        <textPath href={`#${edgeId}`} startOffset="50%" textAnchor="middle" className="text-xs fill-slate-700">
+        <textPath
+          href={`#${edgeId}`}
+          startOffset={startOffset}
+          textAnchor="middle"
+          className="text-xs fill-slate-700"
+        >
           {data.label}
         </textPath>
       </text>